I've been trying to build an astable multivibrator circuit using two BC547B NPN transistors.
I know how to build one using a 555 timer, but I'm having some problems using transistors.
I should've gotten a square wave of 0-5 V with a frequency of 500 Hz and duty cycle 0.5, but according to LTspice, I get a flat 5V output.
Can someone suggest where am I going wrong?
Also, I want the current driven to be of the order of some 3-4 mA.
In that case, are the values I've chosen for the resistors and capacitors OK, or should I make some changes?
PS: I'm working on LTspice. I can work only with 2 NPN BJTs of model BC547B, and a single power supply.